Signboard frame



FIG. 1 is a perspective view of a signboard frame showing our new design;

FIG. 2 is a fragmentary front elevational view thereof, the rear elevational view being a mirror image;

FIG. 3 is a fragmentary exterior side elevational view thereof;

FIG. 4 is a fragmentary interior side elevational view thereof; and

FIG. 5 is a sectional view taken along line V--V in FIG. 1. 

The ornamental design for signboard frame, as shown and described. 